JP3145017B2 - Water pipe bridge with walkway - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pipe bridge with a walkway, which is composed of a plurality of cast iron pipes and has a walkway for an operator to walk for inspection.

[0002]

2. Description of the Related Art Conventionally, a water pipe bridge is composed of a pipe having a gentle curvature formed by joining a plurality of pipes, and is installed on a river or the like. Of these, for water pipe bridges formed by joining steel pipes, an inspection corridor was provided by welding to the steel pipes over the entire length of the pipeline.

[0003]

As described above, it is relatively easy to weld the corridor with a steel pipe as described above. However, for a water pipe bridge formed by joining cast iron pipes (such as ductile cast iron pipes). However, it is difficult to weld compared to steel pipes, and when welding the corridor to the cast iron pipe over the entire length of the pipeline, the welding work is difficult because the number of welded parts is very large. For this reason,
Attaching a walkway to a water pipe bridge formed by joining cast iron pipes was avoided.

[0004] In view of the above, the first aspect of the present invention provides a water pipe bridge formed by joining a plurality of cast iron pipes and having a corridor by greatly reducing a welded portion to the cast iron pipe. It is intended to do so.

[0005]

Means for Solving the Problems In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention comprises a plurality of cast iron tubes joined by inserting an insertion port into a receiving port. In the constructed water pipe bridge, a walkway along the pipe axis direction is arranged above the water pipe bridge, a fixing flange is provided on the outer peripheral surface of the receiving port, and the fixing flange is provided at a plurality of locations in the circumferential direction. A support member for supporting the walkway is fixed via the provided fasteners.

[0006] According to this, since the supporting member for supporting the walkway is fixed to the fixing flange through the fasteners arranged at a plurality of locations in the circumferential direction, welding to the cast iron pipe is performed by the fixing flange. Therefore, the support member can be attached to the receiving port side with a significantly reduced welding portion to the cast iron pipe.

[0007] In addition, due to the wind pressure applied to the walkway, a rotational force for rotating the support member in the circumferential direction of the pipe acts.
Since the support member is fixed by a plurality of fasteners in the circumferential direction, it can withstand a large rotational force.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 4, reference numeral 1 denotes a water pipe bridge constructed on a river or the like, and a plurality of ductile cast iron pipes 2 are provided.
And a pipe 3 having a gentle curvature. An air valve 4 is provided at the center of the pipe 3. Above the water pipe bridge 1, a walkway 5 for inspection is provided along the pipe axis direction.

As shown in FIG. 3, an insertion port 6 is formed at one end of the ductile cast iron pipe 2, and a receiving port 7 is formed at the other end. The plurality of ductile cast iron pipes 2 are joined by inserting the insertion port 6 of one ductile cast iron pipe 2 into the receiving port 7 of the other ductile cast iron pipe 2.

On the inner peripheral surface of the opening of the receiving port 7, a tapered surface 8 is formed over the entire circumference, and between this tapered surface 8 and the outer peripheral surface of the insertion port 6, an annular rubber ring 9 is provided as a sealing material. Is fitted. Further, a lock ring receiving groove 10 is formed on the inner peripheral surface of the receiving port 7 and behind the tapered surface 8, and the lock ring receiving groove 10 is formed by cutting one portion in the circumferential direction. A lock ring 11 having a split structure is fitted. Between the lock ring 11 and the rubber ring 9, a backup ring 12 is fitted on the insertion opening 6. A protrusion that engages with the lock ring 11 in the pipe axis direction to prevent detachment of the insertion port 6 from the receiving port 7 on the outer periphery of the distal end of the insertion port 6.
13 are formed over the entire circumference.

A push ring 14 for pressing the rubber ring 9 in the insertion direction of the insertion port 6 is externally fitted to the insertion port 6. The pressing wheel 14 has a split structure divided into two in the circumferential direction. A plurality of T-head bolts 16 and nuts 17 for pulling the pressing ring 14 in the insertion direction of the insertion port 6 are provided at a plurality of positions in the circumferential direction of the reception port flange 15 formed at the end of the reception port 7. These nuts 17
Is pressed, the pressing ring 14 moves in the insertion direction of the insertion port 6, and the rubber ring 9 is pressed in the insertion direction of the insertion port 6.

A semicircular fixing flange 19 is welded to the outer peripheral surface of the upper half of the receiving port 7 at a position deeper than the receiving flange 15. A receiving-side support member 20 for supporting the walkway 5 from the receiving port 7 side is fixed to the fixing flange 19. That is, the receiving-side support member 20 is provided on both sides of the upper surface of the supporting plate 21 which is fitted to the outer peripheral surface of the upper half of the receiving port 7 and is formed to be wider toward the upper part. Angle members 22 and side support plates 23 provided on both sides of the upper portion of the support plate 21 and formed wider in the pipe axis direction toward the upper side.
It is composed of

The support plate 21 is provided at a plurality of positions in the circumferential direction (FIG. 2).
The hexagonal bolt 25 (an example of a fastener) inserted into the upper part and the left and right side portions) and a nut 26 (an example of a fastener) screwed to these hexagonal bolts 25 form a fixing flange 19. Connected and fixed. Also, as shown in FIG.
The angle member 22 and the side support plate 23 are integrally welded via a mounting plate 28, and the mounting plate 28 is connected and fixed to the support plate 21 with bolts and nuts 29, so that the angle member 22 is fixed.
22 and the side support plate 23 are attached to the support plate 21.

The corridor 5 is provided with a walking board 31 on which the worker walks.
And a side frame 33 provided with a handrail 32. The step board 31 is divided into a plurality of pieces in the pipe axis direction, is supported between the angle members 22 on both sides, and is fixed by bolts 47. At the lower portion of the step board 31, a convex portion 31a is formed between the angle members 22 on both sides so as to be detachable. Further, the side frame 33 is divided into a plurality of parts in the pipe axis direction. Connected and fixed. The bolt
The bolt hole 36 of the side frame 33 into which the 34 is inserted is formed as a long hole elongated in the tube axis direction.

As shown in FIG. 1, an insertion-portion-side support member 38 that supports the walkway 5 is also provided at the insertion opening 6.
The insertion-side support member 38 includes a support plate 39, an angle member 40, and a side support plate 41, similarly to the reception-side support member 20, and the support plate 39 is fitted over the insertion opening 6. It is welded to a mounting band 42 made of steel. This mounting band 42 has a split structure divided into two in the circumferential direction, and includes a bolt 43 and a nut.
It is attached by sandwiching the outer peripheral surface of the insertion port 6 with 44. A rubber plate is provided between the mounting band 42 and the insertion opening 6.
45 is sandwiched.

The operation of the above configuration will be described below.
According to this, the reception-side support member 20 that supports the walkway 5 is
Hex bolts 25 and nuts 26 arranged at multiple locations in the circumferential direction
And is fixed to the fixing flange 19 via
Welding to the ductile cast iron pipe 2 only requires the fixing flange 19 described above. Therefore, the welded portion to the ductile cast iron pipe 2 can be greatly reduced, and the receiving-side support member 20 can be attached to the receiving port 7 side. it can. Similarly, since the insertion-side support member 38 is fixed to the insertion port 6 by being fixed by the mounting band 42, the insertion-side support member 38 can be attached to the insertion port 6 without welding. As described above, the corridor 5 can be easily provided by greatly reducing the welding portion to the ductile cast iron pipe 2.
Inspection of the water pipe bridge 1 consisting of

The wind pressure received by the walkway 5 causes a rotational force to rotate in the circumferential direction of the pipe 2 on the receiving-side support member 20, but the receiving-side support member 20 is provided with a plurality of hexagons in the circumferential direction. Since it is fixed by the bolt 25 and the nut 26, it can withstand a large rotational force.

Further, when the insertion port 6 moves in the pipe axis direction with respect to the receiving port 7 due to changes in the ground or thermal expansion of the ductile cast iron pipe 2, the walkway 5 also moves in the pipe axis direction by the length of the bolt hole 36. Therefore, the movement of the insertion port 6 in the tube axis direction can be absorbed.

In the above embodiment, the hexagon bolt 25 and the nut 26 are used as an example of the fastener, but a hexagon socket head bolt or the like may be used.

[0020]

As described above, according to the first aspect of the present invention, the support member for supporting the walkway is:
Since it is fixed to the fixing flange via fasteners arranged at multiple locations in the circumferential direction, welding to the cast iron pipe only requires the fixing flange, so the welded part to the cast iron pipe is greatly reduced With less, the support member can be attached to the receiving side. In this way, the welded portion to the cast iron pipe can be significantly reduced, so that the cast iron pipe can easily be provided with a previously avoided walkway, and the walkway can be used to inspect a water pipe bridge made of cast iron pipe. Easy to do.

In addition, due to the wind pressure applied to the walkway, a rotational force acting on the support member to rotate in the circumferential direction of the pipe acts.
Since the support member is fixed by a plurality of fasteners in the circumferential direction, it can withstand a large rotational force.

[Brief description of the drawings]

FIG. 1 is a side view of a support member of a water pipe bridge with a walkway according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG.

FIG. 3 is an enlarged sectional view of a joint portion of a cast iron tube.

FIG. 4 is a side view of a water pipe bridge with a walkway.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water pipe bridge 2 Ductile cast iron pipe 5 Walkway 6 Inlet 7 Receptacle 19 Fixing flange 20 Reception side support member 25 Hex bolt (fastener) 26 Nut (fastener)

Claims (1)

(57) [Claims] 1. A water pipe bridge composed of a plurality of cast iron pipes joined by inserting an insertion opening into a receiving opening, wherein a walkway along a pipe axis direction is arranged above the water pipe bridge. A fixing flange is provided on the outer peripheral surface of the receiving port, and a support member for supporting the walkway is fixed to the fixing flange via fasteners arranged at a plurality of locations in the circumferential direction. Aqueduct with walkway.